feat: Add endpoints_per_pool Prometheus metric for hash-based routing#550
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src/code.cloudfoundry.org/gorouter/metrics/compositereporter.go
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Rename DeleteEndpointsPerPool to UncaptureEndpointsPerPool, add metric cleanup on route pruning and LB algorithm changes, and add tests.
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Linked with cloudfoundry/docs-running-cf#143
Summary
endpoints_per_poolPrometheus gauge metric with labelsrouteandlb_algorithm, reporting the number of endpoints per route pool for routes using hash-based load balancingMotivation
Hash-based routing distributes requests based on a consistent hash, which can degrade when the instance count for a pool becomes too high. This metric provides visibility into the endpoint count per hash-based routing pool, keeping metric cardinality low by only tracking hash-based routes.
Backward Compatibility
Breaking Change? No
Note on AI usage
Parts of this code and tests were developed with assistance from Claude Code (claude-opus-4-20250514).